When moving the projector screen, please always hold it on the large frame posts, not the screen support itself. There is a part that can move with a bit of force, or maybe it slides on its own when we move the whole frame. If you notice the screen looks tilted sideways, you can check if this is the issue. In the picture below, the red arrow points to a small bar that should be level with the support behind it. But here it had slid down a few centimeters.
If you run into this problem you can try to force it back up, or please ask me if I’m around. If it’s a recurring issue I’ll find a better fix. As always, please let me know if this or anything unusual or unexpected happens.